Electric transformer



" (No Model.) W. K. FREEMAN.

ELECTRIC TRMISPORMLRl No. 553,847. l Patented Feb. 4, 1896.

x rl l n l ll UNITED STATES PATENT OFFICE.

lVALTER K. FREEMAN, OF FORT lVAYNE, INDIANA.

ELECTRIC TRANSFORM ER.

SFECIFICATION forming part of Letters Patent No. 553,847, dated February4, 1896.

Application tiled July 5, 1895. Serial No. 555,053. (No model.) l

clear, and exact description of the same, reference being had to theaccompanying drawings, forming a part of this specification, and to theletters of reference marked thereon.

The object of this invention is to provide a transformerwherein themagnetic frame may beA separated in solid sections for the purpose ofremoving, renewing, or repairing the coil or coils, a furtherobj ectbeing to provide such a construction in which the sections of the framesshall be so shaped as to occasion the least possible interruption orbreaks in the lines of force or magnet-ic currents induced therein bythe current flowing through the coils.

With this obj ect in view the invention consists in certain noveldetails of construction and combinations and arrangements of parts, allas will be now described and pointed out particularly in the appendedclaims.

Referring to the accompanying drawings, Figure l is a perspective viewof a magnetic frame for transformers or inductoriums,show ing theconfiguration, but without showing the lamina,the lines of divisionbetween which would tend to confuse the eye. Fig. 2 is an vend elevationshowing the coils in place. Fig.

3 is a plan view showing the plates and a diagrammatic representation ofthe coils. Figs. 4 and 5 are detail elevations of oppositely-arrangedplates. Fig. 6 is a diagrammatic view showing the contour of theengaging-surfaces of the central projections.

Like letters of reference in the several figures indicate the sameparts.

By reference to the drawings it will be seen that the body of mytransformer is built up, as is usually the case, of a series of superposed plates, and the coils are adapted to pass through apertures formedin the whole series of plates, so as to inclose-within them a sec tionor sections of all of the plates, while other portions of the plates inturn surround the coil. Now, with a transformer of this con struction Ipropose to connect the plates together by bolts into two solid sections,the

division-line between which sections shall be so arranged as to permitof the sections being separated when desired, so as to allow of theremoval or repair of the coil, and at the same time to so construct theconnecting portions that there will be little or no diflicultiesencountered through the interruption or interference with the magneticlines of force induced in the frames by the current flowing through thecoils. To accomplish this the plates of both sections are provided withfingers or projections, each of which is of sufficient length to passentirely through the coils, and the iingers or projections on the saidsections are arranged to abut instead of being lapped, as has heretoforebeen usually done in ind uctoriums of this general character.

The letter A indicates a plate or series of plates for one side of theinductorium having bolt-holes a, through which bolts may be passed tounite the plates in a solid section, each of the plates A being providedwith arms B having their inner edges dared outwardly so as to receivebetween them inwardly-inclined edges of arms D on the opposite orcooperating plates F. The plates F are also united into a solid section,and when t-he two sections are brought together in the positionsindicated in Figs. l and 2 the arms fit within each other, as juststated, and by using` moderate force they are caused to wedge tightlytogether, forming, for all practical purposes, complete plates orframes. The central arms G are fitted within the coils and are ofsubstantially the same shape on both plates; but reversely arranged-thati3 to say, togethern they form a rectangular connecting portion betweenthe sides.

In order to insure a contact between the central arms regardless of theparticular point where the wedging-surfaces bind, the said central armsare provided with bearing surfaces at M, with relation to which thewedging-surfaces are arranged at an equal inclination, as will bereadily understood from Fig. G. These bearing-surfaces M slide upon eachother as the sections are brought together and insure a magnetic Contactunder all conditions.

To facilitate the entry of the central arms they are provided withreduced ends, preferably struck on a circle, as shown, each arm IOO thushaving a wide base and tapering body, which, when the sections areproperly seated together, insures a contact between 'the central armsthroughout the length, making, for all practical purposes, completeplates with openings through the whole body for the passage of the coilll, but at the same time, when so desired, the two sections may bereadily separated i'or the purposes before mentioned.

The plates being abutted there is no necessity for leavingI openingsbetween adjacent plates, as is necessary where the arms are lapped oneupon the other, as in prior constructions.

The invention herein described and claimed is subordinate to theinvention shown, described, and claimed in my pending applica tions,Serial No. 271,981, Afiled April 25, 1888, and Serial No. 371,527, filedNovember '15, 1890, as a division of said earlier application of 1888.

Having thus described my invention, what I claim as new isl. r1`heherein-described co-operating inductorium-plates havingoppositely-extending arms, the arms on one plate having their inneredgesinclined and the arms on the opposite plate having their outeredges inclined, whereby when the two are brought together the inclinedsurfaces co-operate and wedge together without lateral displacement o1either plate with relation to the other; sub stantially as described.

2. In an inductorium, the combination with the coils, of magneticframe-plates connected together in solid sections and havingoppositely-extending arms, the arms on one section having their inneredges inclined and the arms on the other section having their outeredges inclined, said inclined edges l,

adapted to abut and form a wedgin g connection between the sectionswithout lateral displacement of the sections with relation to eachother; substantially as described.

3. In an inductorium, the combination with the magnetic frame-plateshaving the arms at opposite extremes with their inner edges inclined andthe intermediate arm with one straight edge and one edge forming abearing arranged at equal angle to both inclines, ol' the co-operatingplates having the arms with their outer edges inclined and theintermediate arms with one straight edge torni ing a bearing arranged atequal angles to both in elines, the inclined edges of said arms beingadapted to co-operate and abut to form wedging connections, and saidarms being of sulli cient length to bridge the space between the bodiesof the plates; snbstantiall y as dcscribed.

VALTER K. FREEMN.

Yl/itnesses:

ALEX. 8. STEUART, A. M. KELLY.

